ИСТИНА

Here we demonstrate how diffraction limited information on the polarized intensity distribution can be obtained using a ground-based telescope and an instrument combining properties of a speckle interferometer and a dual-beam polarimeter. By processing of a series of short-exposure, seeing limited images of an object, obtained simultaneously through two beams of polarimeter, the ratio of visibilities at orthogonal polarizations is estimated. Assuming that the object is dominated by unpolarized unresolved source, e.g. star, the image of polarized circumstellar envelope can be recovered from the described ratio of visibilities. With speckle polarimeter, an instrument implementing DSP at 2.5-m SAI MSU telescope, differential polarimetric visibility can be measured with precision of 0.002 for R=6 star in 150 sec of accumulation.